Enabled AMR ghost zone information in avtIVPVTKField; integral curves  
    now correctly descend into finer levels as encountered (Eduard Deines).  

    Modified domain transition handling in avtIntegralCurve::Advance() to
    push across the boundary with smaller steps.

    Adapted the IC algorithms and the Poincare plot to the new terminology.  

    Cleanup of status and termination flags used between avtIVPSolver and  
    avtIntegralCurve.  

    Introduced explicit DIRECTION flag for avtIntegralCurve to allow more robust  
    handling of integration direction; this was previously inferred from the  
    termination criterion, which is not compatible with pathlines.  

    Refactored termination handling out of the avtIVPSolver subclasses, it is now  
    the responsibility of avtIntegralCurve::AnalyzeStep().  
    avtIntegralCurve::Advance() now explicitly respects temporal bounds of  
    avtIVPField. (avtIntegralCurve::DoAdvance() was merged into  
    avtIntegralCurve::Advance()).  

    Reduce role of avtIVPStep: avtIVPField::ComputeScalarVariable() now uses an  
    index-based instead of variable name strings, the mapping is set through  
    avtIVPField::SetScalarVariable().  

    Total rewrite of avtStateRecorderIntegralCurve to use a flat storage scheme  
    that reduces memory consumption tremendously. Adapted  
    avtStreamlinePolyDataFilter correspondingly.  

    avtStateRecorderIntegralCurve::Serialize() now also transmits the serialize  
    flags, ensuring that sender and receiver agree on what is transmitted; this  
    fixes current crashes in parallel IC algorithms.  

    New cell locator infrastructure based on avtCellLocator, for now local to the  
    IVP module. The previously used vtkVisItCellLocator was reimplemented as  
    avtCellLocatorClassic. Added cell locators for rectilinear  
    (avtCellLocatorRect) and unstructured meshes (avtCellLocatorBIH). The new  
    infrastructure is more robust, faster and consumes less memory for  
    (un)structured meshes; fast paths for specific mesh and cell types are  
    introduced that avoid calls to VTK methods which are not thread-safe and slow  
    (e.g. unstructured tet/hex). Locators are now stateless and can be safely  
    shared between multiple threads (in preparation for David Camp's hybrid  
    parallel work) and cached in the pipeline (future work).  

    Rewrote avtIVPVTKField to contain all cell/point location state.  
  
    avtParICAlgorithm now handles the case of no seedpoints without crashing.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@12139 18c085ea-50e0-402c-830e-de6fd14e8384